CN214366020U

CN214366020U - Hydraulic reversing type positioning sealing structure

Info

Publication number: CN214366020U
Application number: CN202022931489.8U
Authority: CN
Inventors: 杜福云; 李越; 周欢; 陆仁德; 王厚东; 李效波; 李英松; 郑金中; 时营磊; 徐凤祥; 程文佳; 褚建国
Original assignee: China Oilfield Services Ltd
Current assignee: China Oilfield Services Ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-10-08
Anticipated expiration: 2030-12-07

Abstract

The application discloses a hydraulic reversing type positioning and sealing structure which comprises a central tube, a shell, a positioning push cylinder and a setting push cylinder, wherein the shell, the positioning push cylinder and the setting push cylinder are sleeved on the central tube and form a hydraulic cavity in a surrounding manner; when the positioning push cylinder moves upwards relative to the central pipe, the pressure in the hydraulic cavity is increased to enable the setting push cylinder to move downwards relative to the central pipe, an outer cone is arranged at the lower end of the central pipe, a sealing ring is connected to the lower end of the setting push cylinder and abuts against a guide inclined plane of the outer cone, and when the setting push cylinder presses down the sealing ring, the guide inclined plane extrudes the sealing ring to enable the diameter of the sealing ring to be increased.

Description

Hydraulic reversing type positioning sealing structure

Technical Field

The application relates to the field of sealing of downhole tools for oil field well completion, in particular to a hydraulic reversing type positioning sealing structure.

Background

At present, positioning sealing is needed to be used during sand prevention of a hot production well of an offshore oil field, the conventional positioning sealing is used in a high-temperature and high-pressure underground environment of the hot production well, and under the using conditions of multiple rounds of hot fluid huff-puff operation and cold and hot alternation bearing, a sealing unit is easy to deform and damage and even to be carbonized and cracked to disappear, so that the sealing effectiveness can not be ensured, the sand blocking fails, and the problem that an inner pipe column or a shaft is buried by sand occurs.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a hydraulic reversing type positioning and sealing structure which is tight in sealing, reliable in working and not easy to damage.

The embodiment of the application provides a hydraulic reversing type positioning and sealing structure which comprises a central tube, a shell, a positioning push cylinder and a setting push cylinder, wherein the shell, the positioning push cylinder and the setting push cylinder are sleeved on the central tube,

the shell, the positioning push cylinder and the setting push cylinder surround to form a hydraulic cavity; when the positioning push cylinder moves upwards relative to the central tube, the pressure in the hydraulic cavity is increased to move the setting push cylinder downwards relative to the central tube,

the sealing device is characterized in that an outer cone is arranged at the lower end of the central tube, a sealing ring is connected to the lower end of the setting push cylinder, the sealing ring abuts against a guide inclined plane of the outer cone, and when the setting push cylinder presses down the sealing ring, the guide inclined plane extrudes the sealing ring to increase the diameter of the sealing ring.

Compared with some technologies, the method has the following beneficial effects:

the hydraulic reversing type positioning and sealing structure provided by the embodiment of the application can ensure the effectiveness of sealing under the use conditions of high temperature and high pressure, multiple rounds of hot fluid huff and puff operation and cold and hot alternation bearing, and has high working reliability. The swelling deformation (diameter expansion) of sealing ring compares interference fit's sealing unit, and is low to the sealed section of thick bamboo machining precision requirement of external packer, and the adaptability is better.

Other features and advantages of the present application will be set forth in the description that follows.

Drawings

The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.

FIG. 1 is a first schematic view of a hydraulically commutated positioning seal arrangement according to an embodiment of the present application;

FIG. 2 is an enlarged view of the structure of portion A of FIG. 1;

FIG. 3 is an enlarged view of the structure of portion B of FIG. 1;

fig. 4 is a second schematic diagram of the hydraulic reversing type positioning and sealing structure in the embodiment of the present application.

Illustration of the drawings:

1-central tube, 11-outer cone, 111-guide inclined plane, 12-upper end buckle, 13-lower end buckle, 2-outer shell, 21-oil injection channel, 22-plug installation hole, 3-middle shell, 31-pressure transmission hole, 4-positioning push cylinder, 5-setting push cylinder, 6-locking ring, 7-sealing support frame, 8-sealing ring, 91-first hydraulic cavity and 92-second hydraulic cavity.

Detailed Description

To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The existing underground sealing structure cannot meet the long-term sealing requirement under the conditions of high temperature and high pressure and multiple times of hot and cold alternation for conventional positioning and sealing. For the all-metal positioning seal in interference fit, the requirement on the processing precision of a sealing barrel of an external packer is very high and is difficult to realize, and if the precision fit is not good, the sealing property is poor. For the positioning sealing of the soft metal sealing unit, a setting tool is required to press and set the inner part of the central tube, and the operation is complex. For the positioning seal of the lower positioning soft metal sealing unit, the length of the lower extension pipe needs to be customized according to different external packers, certain requirements are also required on the processing precision, and the design preparation is troublesome.

The embodiment of the application provides a hydraulic reversing type positioning and sealing structure, as shown in fig. 1 to 4, the hydraulic reversing type positioning and sealing structure comprises a central tube 1, a shell, a positioning push cylinder 4 and a setting push cylinder 5, wherein the shell, the positioning push cylinder 4 and the setting push cylinder 5 surround to form a hydraulic cavity; when the location pushing cylinder 4 moves up relative to the central tube 1, the pressure in the hydraulic cavity increases to enable the setting pushing cylinder 5 to move down relative to the central tube 1, the lower end of the central tube 1 is provided with an outer cone 11, the lower end of the setting pushing cylinder 5 is connected with a sealing ring 8, the sealing ring 8 abuts against a guide inclined plane 111 of the outer cone 11, when the setting pushing cylinder 5 presses down the sealing ring 8, the guide inclined plane 111 extrudes the sealing ring 8 to enable the sealing ring 8 to expand, and the diameter of the lower end of the sealing ring 8 is increased.

After the tool is put into a well and reaches a designated position, the positioning push cylinder 4 contacts a positioning step of an external packer, the upper pipe column is pressed down, the central pipe 1 continues to move downwards, the positioning push cylinder 4 moves upwards relative to the central pipe 1 at the moment, the volume of the hydraulic cavity is reduced, the pressure is increased, and then the setting push cylinder 5 moves downwards relative to the central pipe 1. The lower end of the setting push cylinder 5 props against and presses the sealing ring 8 downwards, and the sealing ring 8 expands along the guide inclined plane 111 of the outer cone 11 to form sealing with a sealing cylinder (not shown in the figure) of an external sand control packer.

In an exemplary embodiment, as shown in fig. 1 and fig. 2, the housing comprises a middle housing 3 and an outer housing 2, the hydraulic chambers comprise a first hydraulic chamber 91 and a second hydraulic chamber 92, the middle housing 3 is sleeved on the central tube 1, and the middle housing 3, the central tube 1 and the setting push cylinder 5 surround to form the first hydraulic chamber 91; the outer shell 2 is sleeved on the middle shell 3 and the central pipe 1, the outer shell 2, the middle shell 3 and the positioning push cylinder 4 surround to form a second hydraulic cavity 92, and the first hydraulic cavity 91 is communicated with the second hydraulic cavity 92. The middle housing 3 is provided with a pressure transfer hole 31, and the first hydraulic chamber 91 and the second hydraulic chamber 92 communicate through the pressure transfer hole 31.

After the tool is put into a well and reaches a designated position, the positioning push cylinder 4 contacts a positioning step of an external packer, the upper pipe column is pressed down, the central pipe 1 continues to move downwards, the positioning push cylinder 4 moves upwards relatively at the moment, high-temperature hydraulic oil in the second hydraulic cavity 92 is pushed into the first hydraulic cavity 91, and the setting push cylinder 5 moves downwards relative to the central pipe 1 under the pushing of the pressure of the first hydraulic cavity 91.

In an exemplary embodiment, as shown in fig. 3, a sealing support 7 is further disposed between the setting pusher 5 and the sealing ring 8, the sealing support 7 is sleeved on the central tube 1, and the setting pusher 5 presses the sealing ring 8 downwards through the sealing support 7. The hydraulic reversing type positioning and sealing structure further comprises a locking ring 6, the locking ring 6 abuts against a sealing support frame 7 (the lower end of the locking ring 6 abuts against the upper end of the sealing support frame 7), the locking ring 6 is sleeved on the central pipe 1, and the locking ring 6 is connected with the central pipe 1 through one-way threads.

When the positioning push cylinder 4 moves upwards relative to the central tube 1, high-temperature hydraulic oil in the second hydraulic cavity 92 is pushed into the first hydraulic cavity 91, the setting push cylinder 5 moves downwards relative to the central tube 1 under the pushing of the pressure of the first hydraulic cavity 91, the setting push cylinder 5 pushes the sealing support frame 7 to move downwards, and the sealing ring 8 deforms and expands under the extrusion of the guide inclined planes 111 of the sealing support frame 7 and the outer cone 11 to form sealing with the sealing cylinder of the external sand control packer.

When the central tube 1 descends, the center drives the locking ring 6 to descend together through the spring (the upper end of the locking ring 6 is connected with the spring, the figure is not shown), the locking ring 6 supports the sealing support frame 7 and moves downwards together, the locking ring 6 is provided with one-way threads, the locking ring 6 can only move downwards relative to the central tube 1 (the locking ring 6 can not move upwards relative to the central tube 1), the sealing ring 8 is prevented from returning (moving upwards) to cause the sealing between the sealing ring 8 and the sealing cylinder of the external sand control packer to be loose, and the sealing ring 8 can still play a good sealing role when the pressure of a hydraulic cavity fluctuates.

The one-way thread can be an asymmetric triangular thread, namely, one side of the thread is an inclined plane, and the other side of the thread is a vertical plane.

In an exemplary embodiment, as shown in fig. 2, the oil filling passage 21 is provided on the outer housing 2, and the oil filling passage 21 is connected to the second hydraulic pressure chamber 92. An end cap mounting hole 22 is formed in the upper end face of the outer shell 2, the end cap mounting hole 22 is connected with the oil injection channel 21, and the end cap mounting hole 22 is used for mounting an end cap to seal the oil injection channel 21.

Inject hydraulic oil into second hydraulic pressure chamber 92 (and first hydraulic pressure chamber 91) through oiling passageway 21, after finishing injecting, stop up end cap mounting hole 22 with the end cap, make first hydraulic pressure chamber 91 and second hydraulic pressure chamber 92 become confined cavity, the relative upward movement of location pushing cylinder 4 makes the hydraulic oil pressure increase of hydraulic pressure intracavity, and then make the setting pushing cylinder 5 move down, setting pushing cylinder 5 pushes down sealing ring 8 through sealed support frame 7, form sealedly between 8 inflation of sealing ring and the sealed section of thick bamboo of outside sand control packer.

In an exemplary embodiment, the seal ring 8 is a metal seal ring.

The sealing ring 8 is made of metal, so that the working reliability under the high-temperature and high-pressure environment can be improved, the environment adaptability is strong, the working reliability is high, and the sealing ring can be used repeatedly.

In an exemplary embodiment, as shown in fig. 1, the upper end of the central tube 1 is provided with an upper end buckle 12, and the middle shell 3 and the outer shell 2 are connected to the central tube 1 through the upper end buckle 12. The upper end of the central tube 1 is provided with an upper end buckle 12, and the central tube 1 is connected with an upper joint through the upper end buckle 12; the lower end of the central tube 1 is provided with a lower end buckle 13, and the central tube 1 is connected with the lower joint through the lower end buckle 13.

An upper end button 12 at the upper end of the central tube 1 can be used to connect the upper joint and thus connect the central tube 1 to the upper string. And, the middle case 3 and the outer case 2 can be connected to the central tube 1 through the upper end buckle 12 (i.e., the middle case 3 and the outer case 2 are respectively provided with an internal thread corresponding to the upper end buckle 12). A lower end button 13 at the lower end of the central tube 1 can be used for connecting a lower joint. Of course, the lower end button 13 at the lower end of the central tube 1 can also be used for connecting other sealing units with interference fit.

The hydraulic reversing type positioning and sealing structure provided by the embodiment of the application adopts hydraulic reversing type all-metal positioning and sealing, adopts all-metal mechanism design, and the sealing unit (namely the sealing ring 8) is also made of metal, so that the hydraulic reversing type positioning and sealing structure can be used in high-temperature and high-pressure environments, and ensures sealing effectiveness under the use conditions of multiple rounds of hot fluid huff and puff operation and cold and hot alternation. And meanwhile, the upper positioning and hydraulic reversing structure is used for realizing mechanical setting, the operation is simple, and the use requirement of the sand control pipe column for the thick oil thermal recovery well of the offshore oil field can be effectively met.

The hydraulic reversing type positioning and sealing structure provided by the embodiment of the application can adopt an all-metal structure, the metal sealing unit (namely the sealing ring 8) forms effective sealing with the sealing barrel of the external packer under the action of pressure, the temperature influence is small, and the sealing reliability is high. The expansion deformation of the metal sealing unit is lower in requirement on the machining precision of the sealing barrel of the external packer and better in adaptability compared with the sealing unit in interference fit. The positioning and hydraulic steering mode is used, a setting tool is not needed, the operation is convenient, and the applicability is strong. The hydraulic pressure for providing the setting force is provided by the lower pressure of the pipe column, the pressure is unchanged after the integral pipe column is in place, and meanwhile, the locking ring 6 prevents the rollback, so that the effectiveness of setting is ensured.

In the description of the present application, it should be noted that the directions or positional relationships indicated by "upper", "lower", "one end", "the other end", and the like are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present application and simplifying the description, and do not indicate or imply that the structures referred to have a specific direction, are configured and operated in a specific direction, and thus, cannot be construed as limiting the present application.

In the description of the embodiments of the present application, unless expressly stated or limited otherwise, the terms "connected," "mounted," and "installed" are to be construed broadly, e.g., the term "connected" may be a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The embodiments described herein are exemplary rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.

The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements that have been disclosed in this application may also be combined with any conventional features or elements to form unique aspects as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other aspects to form another unique aspect as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

Claims

1. A hydraulic reversing type positioning and sealing structure is characterized by comprising a central tube, a shell, a positioning push cylinder and a setting push cylinder, wherein the shell, the positioning push cylinder and the setting push cylinder are sleeved on the central tube,

2. The hydraulic reversing type positioning and sealing structure according to claim 1, wherein the housing comprises a middle housing and an outer housing, the hydraulic chamber comprises a first hydraulic chamber and a second hydraulic chamber,

the middle shell is sleeved on the central pipe, and the middle shell, the central pipe and the setting push cylinder are encircled to form the first hydraulic cavity; the outer shell is sleeved on the middle shell and the central tube, and the outer shell, the middle shell and the positioning push cylinder surround to form the second hydraulic cavity,

the first hydraulic chamber communicates with the second hydraulic chamber.

3. The hydraulic reversing type positioning and sealing structure according to claim 2, wherein a pressure transmission hole is formed in the middle shell, and the first hydraulic cavity and the second hydraulic cavity are communicated through the pressure transmission hole.

4. The hydraulic reversing type positioning and sealing structure according to claim 2, wherein a sealing support frame is further arranged between the setting push cylinder and the sealing ring, the sealing support frame is sleeved on the central pipe,

the setting push cylinder presses the sealing ring downwards through the sealing support frame.

5. The hydraulically commutated positioning and sealing structure of claim 4, further comprising a lock ring against which the seal support cage is urged,

the locking ring is sleeved on the central pipe, and the locking ring is connected with the central pipe through one-way threads.

6. The hydraulic reversing type positioning and sealing structure according to any one of claims 2 to 5, characterized in that an oil filling channel is arranged on the outer shell and is connected with the second hydraulic cavity.

7. The hydraulic reversing type positioning and sealing structure according to claim 6, wherein a plug mounting hole is formed in the upper end face of the outer shell and connected with the oil injection channel,

the plug mounting hole is used for mounting a plug so as to seal the oil injection channel.

8. The hydraulically commutated positioning and sealing structure according to any of claims 1 to 5, wherein the sealing ring is a metal sealing ring.

9. The hydraulically commutated positioning and sealing structure according to any one of claims 2 to 5, wherein the central tube is provided at its upper end with an upper end buckle, and the middle and outer housings are connected to the central tube by the upper end buckle.

10. The hydraulic reversing type positioning and sealing structure according to any one of claims 1 to 5, characterized in that an upper end buckle is arranged at the upper end of the central pipe, and the central pipe is connected with an upper joint through the upper end buckle; the lower end of the central tube is provided with a lower end buckle, and the central tube is connected with the lower joint through the lower end buckle.